IS:6630-1985 (Reaffirmed 2002) Indian Standard SPECIFICATION FOR SEAMLESS FERRITIC ALLOY STEEL PIPES FOR HIGH TEMPERATURE STEAM SERVICES ( First Revision ) First ReprintAkIL 1996 UDC 621.643.2-977[669.15-194.57-462.31 0 Copyright 1986 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG N6W DELHI 110002 Q-5 February 1986 IS:6630-1985 Indian Standard SPECIFICATION FOR SEAMLESS FERRITIC ALLOY STEEL PIPES FOR HIGH TEMPERATURE STEAM SERVICES ( First Revision ) Steel Tubes, Pipes and Fittings Sectional Committee, SMDC 22 Chairman Representing SHRIS. C. DHINQRA Members Sntu A. S. AGARWAL Sum R. S. PATHAK ( Alternate ) SHRIK. N. AI~UIA SHRIA. S. SHARMA ( Alternate ) SHRIS. N. BASU SHRIT. N. UBOVEJA ( Alternute ) SIBI H. S. BEDI Ministry of Industry Steel Tubes of India Ltd. Dewas FedgF;e;: Engineering Industries of India, Directorate General of Supplies & Disposals ( Inspection Wing ), New Delhi Steel Authority of India Plant ). Rourkela Ltd ( Rourkela Steel SHRI P. K. MOHAPATRA ( Alternate j Sum D. P. BHAT~ACHARJBB Export Inspection Council, Calcutta SHRIS. C. ARORA (Alternate) SHIU P. K. CHAKRAVARTY Tata Iron & Steel Co Ltd, Jamshedpur Sruu A. N. MIIXA (Alternate ) Superintendence Co of India (P) Ltd, Calcutta Sum B. B. CHAKRAVBRTI Sum A. K. SHOMB ( Alternute ) Publ~h~;;~~partment ( Public Health Branch ), SHRI L. M. CHAUDHRI SHKU K. K. GANDHI ( Alternute ) SHRIS. C. GUFTA SHRIN. P. JYOI-I ( Alternute ) LT-COLV. B. JADHAV As&&n of Indian Engineering Industry, New SHRIJ. C. MENLNRATTA( Aftbmure 1 Engineers-in-Chief's Branch, Army Headquarters, . . New Delhi (Continued on page 2) 0 Copyright 1986 INDIAN STANDARDS `Ibis publication is protected under the Indian Copyright Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act. BUREAU OF Is:6630-1985 ( Continuedfrompage Members 1) Representing Research Designs & Standards JOINTDIRECTOR STANDARDS ( MP/ ( M'nistry of Railways ). Lucknoworganization Al ) CXEMIST & MBTALLUROIST - I, RDSO ( Alternate ) SZIRISUSHIL JAIN Jain Tube Co Ltd. Ghaziabad SHRIV. K. GUP~A.( Alternate ) Jindal Pipes Pvt Ltd, Ghaziabad SHRIS. C. JAIN SIIRI A. S. SHARMA ( Alternate ) Bharat Steel Tubes Ltd. New Delhi Smu N. P. JYOTI SHIUR. K. ABROL ( Alternate 1 ' Ministry of Agriculture SHRIH. M. KAUL \ Hindustan Shipyard Limited, Vishakhapatnam SHRIM. G. KESAVA RAO SHRIP. L. NARASIMHAM ( Alternate 1 S&warts & Lloyds of India Ltd, Calcutta SHRI B. KUMAR SHRI T. K. BASU ( Alternate) Indian Register of Shipping, Bombay !&RI S. KUMAR SHRIS. CHANDRA ( Alternate ) DR M. D. MAHESHWARI Indian Tube Co Ltd, Jamshedpur SHRID. DUITA ( Alternate ) Fertilizer ( Planning & Development ) India Ltd, SHRIK. MUKHERJE~! dndri SHRI R. K. SINHA ( Alternate ) Tube Products of India, Madras SHRI K. N. R. NAIR DR INCX S. K. SEN( Alternate ) Zenith Steel Pipes & Industries Ltd, Khopdi SHRIS. NEELAKANTAN DR A. R. KESKAR ( Ahernate) Sruu RAJ JASWANT SINGH Dir&Ny;t;eFbyneral of Technical Development, SHRI G. P. SARABHAI SARIV. K. CHATURVEDI( Alternate) Oil & Natural Gas Commission, Dehra Dun Bharat Heavy Electricals itd, Tiruchchirappalli SHRIV. A. SATHGURUNATH SHRIV. RAGHAVENDRAN ( Alternate 1 sujarat Steel Tubes Ltd, Ahmadabad SHRI APOORVA SHAH SHRI H. J. THAKERI Alternate ) SHFU E. SUBBA RAO SHRIP. C. JOHAR: ( Alternate ) SHRI B. R. TANEJA Indian Oil Corporation Ltd, Bombay Indian Seamless Metal Tubes Ltd, Bombay ' Central Boilers Board, New Delhi SHRIK. K. VISWANATHA`M SHRIG. S. GOSAL ( Althmate ) Director General, IS1 ( &-oficio Member ) SHRI K. RA~HAVENDRAN,_ , Director ( Strut & Met ) ( Secretury._.1 SHRI 0. J?.KAKKAR ( Alternate j Joint Secretary SHRI P. N. KOHLI Supervisor ( Drawings ) ( Strut & Met ), ISI ( Cotttinued on page 17 ) 2 IS:6630 -1985 Indian Standard SPECIFICATION FOR SEAMLESS FERRITIC ALLOY STEEL PIPES FOR HIGH TEMPERATURE STEAM SERVICES ( First Revision ) 0. FOREWORD 0.1 This Indian Standard ( First Revision ) was adopted by the Indian Standards Institution on 28 June 1985, after the draft finalized by the Steel Tubes, Pipes and Fittings Sectional Committee had been approved by the Structural and Metals Division Council. 0.2 Specification for seamless ferritic alloy steel pipes for high temperature services was first published in 1972 to meet the increased application of ferritic alloy steel pipes. A revision of the standard has been prepared incorporating the following main changes: IS : 1762 ( Part 1 )-1974*. b) A provision has been made metals. 4 New designations of steel have been incorporated in accordance with for instrumental analysis of the 0.2.1 Elevated temperature properties as given earlier in IS : 6630 - 1972t and in Appendix A have been retained after review, till further data on indigenous steel is available. 0.2.2 Tubes for heat exchangers and stills are not covered by this standard. 0.3 In preparing this standard assistance has been derived from the following: IS0 2605/2-1976 Steel products for pressure purposes - Derivation and verification of elevated temperature properties - Part 2 : Proof stress of austenitic steel products. International Organization for Standardization. *Code for designation of steels: Part 1 Based on letter symbols (first revision ). tSpecificationfor seamless ferritic alloy steel pipes for high temperature service. 3 IS:6630 - 1985 DIN 17175 : 1959Seamless tubes of high temperature steel. Deutscher Normenausschuss. ASTM : A 335-1981 Seamless ferritic alloy steel pipe for high temperature service. American Society for Testing and Materials. 0.4 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS : 2-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. 1. SCOPE 1.1 This standard covers the requirements for seamless ferritic ailoy steel pipes intended for high temperature steam service. Several grades covered in this standard are given in Table 1. TABLE 1 CHEMICAL COMPOSITION (CIauses1.1,4.1,4.1.1,4.1.2,4.2and4.3) GRADE DESIGNATION [REP IS : 1762( PART l )-1974* OLD DEESIONATTON] (1) r--~-__A-.-_ ~RCJINTAGEOF~EMENTS ----v Si Mn P, Max S. Max Cr MO V C (2) (3) ( 16Mo2_0) lXr4Mo6 ( 15CrWM~5J lOCr9M~O ( 10Cr2Mol) 20Cr20Mo6 ( 10CrSMo55_) ( 14Cr45Mo 6OV2fi - o-12 to 0.20 @zzo 0.15, Max 0'15, Max 0.10 to 0.18 0.10 to a35 @lo to 0.35 0.50, ZY Ma; &lo to 0.35 (4) 040 to O-80 OF7F (5) 0940 0940 (6) 0.040 0.040 o@O 0.030 (7) 0.70 to 1.10 @oY,,`" 0*040 0.40 to 0.030 0.70 0.40 to @040 0.70 % to 4.0 to oz" 6.0 0.040 0.30 to 0.50 to 0.60 0.70 (8) 0.25 to 0.35 0.45 to 0.65 09Oto 1.20 (9) 0.22 to 0.32 *Code for designation of steels: Part 1 Based on letter symbols (firsr revision). *Rules for rounding off numerical values ( revised ). 4 IS: 6630 -1985 2. SUPPLY OF MATERIAL 2.1 General requirements relating to the supply of ferritic alloy steel pipes shall conform to IS : 1387-1967*. 3. MANUFACTURE be manufactured by open hearth, electric, basic oxygen or a combination of these processes. In case any other process is employed by the manufacturer, prior approval of the purchaser should be obtained. If the basic oxygen process is employed for manufacture, the nitrogen content of the steel shall not exceed 0.007 percent. 3.2 Sufficient discard should be made from each ingot or billet to secure freedom from harmful piping and undue segregation. 3.3 The pipes shall be made by a seamless process and shall be either hot finished or cold finished, subject to agreement between the purchaser and the manufacturer. 4. CHEMICAL COMPOSITION 3.1 Steel shall from steels which when analysed in accordance with the methods specified in IS : 228t and its relevant parts shall conform to the chemical composition given in Table 1. 4.1.1 The chemical analysis of steel shall be as given in Table 1. The analysis of steel shall be carried out either by the method specified in IS : 228t and its relevant parts or any other established instrumental/ chemical method. In case of dispute the procedure given in IS : 228t and its relevant parts shall be the referee method. However, where the method is not given in IS : 2287 and its relevant parts, the referee method shall be as agreed to between the purchaser and the manufacturer. 4.1.2 Elements not quoted in Table I, shall not be intentionally added without the agreement of the purchaser, other than for the purposes of finishing the heat. All reasonable precautions shall be taken to prevent the addition of such elements from scrap or other materials used in the manufacture, but residual elements may be present provided the mechanical properties and applicability are not adversely effected. *General requirements for the supply of metallurgical materials (first revision ). tMethods of chemical analysis of steels. 4.1 Pipes shall be manufactured IS:6630-1985 4.1.3All steels shall be fully killed. 0.02 percent. Aluminium content shall not exceed 4.2 Ladle Analysis - The steel of each heat shall have ladle anylysis to the grades and chemical composition as given in Table 1. 4.3 Product Analysis - Product analysis of one pipe from each batch of pipe of the same size and wall thickness and from the same heat of'steel shall be made. The results of this analysis shall not differ from the values specified in Table 1 by amounts greater than given below: Element Maximum qf Speci/ication : Permissible Deviation from the Specified Composition (3) fo-03 . fO*05 f f0.10 -+0905 &O*lO f O*04 *o-o5 I 50.03 1 Carbon Manganese Sulphur and phosphorus Chromium Molybdenum Vanadium 5. HEAT TREATMENT (2) GO-20 GO.50 t o-35-1.20 t GO.32 conformlng to grade 20Cr20Mo6 ( lOCr5Mo55 ) shall be supplied in the annealed condition. Pipes conforming to grade 16Mo30 shall be supplied in the normalized or normalized and tempered condition. Pipes conforming to grade 15Cr4Mo6 ( 15Cr90Mo55 ) and 14Cr45Mo 60 V27 shall be supplied in the normalized and t&per&d condition. &pes Gnfbiming to grade lOCr9MolO ( lOCr2Mol ) may be supplied in the annealed or normalized and tempered condition. 6. DIMENSIONS 6.1 Dimensions Table 2. of pipes shall conform to the requirements specified in 5.1 Pities 6.2 Tolerances - The tolerances on outside diameter and wall thicknest shall conform to the requirements specified below and in 6.2.1. 6 IS:6630-1985 TABLE 2 DIMENSIONS ( CZuuse 6.1 ) All dimensions in millimetres. NOMINAL BORE (1) 15 OUTSIDE DIAMETER OF PIPES - i* WALL THICKNESS (3) ;:; 3.2 3.6 3-6 4'0 ;:6" 6.3 7.1 8.8, 7-l 11.0, 8 14'2, 10,6*3 16, 11,8-O 175. 11.8-O 20, 12.5, 8'8 (2) 21.3 269 33.7 42.4 % 73.0 88'9 114-3 141.3 168.3 219-l 273-O 323.9 355.6 406.4 Sizes other than those specified here may 40 50 % 100 125 150 NOTE - be ordered by mutual agreement. Nominal Pipe Size Tolerance Up to and including 40 mm Above 40 mm f0.5 mm fl percent 6.2.1 Tolerances on wall thickness shall be as under: Tolerances on Wall Thickness Seamless All sizes Unlimited -12.5 percent 6.3 Pipes may be supplied in random lengths of 4 to 7 metres. If ordered in exact lengths as agreed to between the supplier and the purchaser, pipes shall be subjected to a plus tolerance of 6 mm. 7. FREEDOM FROM DEFECTS 7.0 The finished pipe shall be reasonably __., defects. I r " __. .I' straight and free from injurious 7 IS : 6630 - 1985 7.1 Depth of Injurious Defects - All defects shall be explored for depth. When the depth is in excess of 5 percent of the nominal wall thickness or encroaches on the minimum wall thickness, such defects shall be considered injurious. 7.2 Machiniug or Grinding Defects not Classified Injurious - Surface defects not classified as injurious shall be treated as follows. 7.2.1 Pipe showing scabs, seams, laps, tears or slivers not more than 5 percent of the nominal wall thickness, need not have these defects removed. If deeper than 5 percent, such defects shall be removed by machining or grinding, provided that the remaining wall thickness is within the specified limits. 7.2.2 Pipe showing inside or outside surface checks ( fish scale ) 0.4 mm or less in depth need not have_ these defects removed. Such defects over 0.4 mm but not more than 0.8 mm in depth shall be removed by machining or grinding. Pipes on which these defects are more than 0.8 mm in depth shall be rejected, unless the manufacturer can demonstrate to the purchaser that the defects are not injurious. 7.2.3 Mechanical marks or abrasions and pits shall be acceptable without grinding or machining provided the depth does not exceed 1.6 mm. If such defects are deeper than 1.6 mm these shall be removed by grinding or machining to sound metal, and the remaining wall thickness shall be within the specified limits. 7.2.4 When defects have been removed by grinding or machining the outside diameter at the point of grinding or machining may be reduced by the amount so removed. Should it be impracticable to secure a direct measurement, the wall thickness, at the point of grinding or at a defect not required to be removed, shall be determined by deducting the amount removed in grinding or the depth of the defect from the minimum measured wall thickness at the ends of the pipe; and the remainder shall not be less than the minimum required wall thickness. 8. MECHANICAL TESTS 8.0 For material heat-treated in batch type furnace, 5 percent of the pipe from each treated lot. For pipe shall be tested. For material heat-treated by tests shall be made on a sufficient number of pipes of the lot, but in no case less than 2 pipes. tests shall be made on small lots at least one thecontinuous process, to constitute 5 percent The manufacturer shall provide at his own expense extra tube at the rate of 2 percent of each diameter and thickness of tube specified and the Inspecting Officer shall select for test such of the tubes as he may think 8 Is:6630-1985 proper to the extent of the percentage mentioned. Should the number of tubes specified or any one nominal size exceed 400, then, for every 100 tubes or part thereof above that number, one additional tube shall be provided. The samples for testing shall not be heat-treated after selection. NOTE - The term `lot' applies to all pipes of the same nominal thickness which are produced from the same heat of steel and subjected finishing treatment in continuous furnaces: when final heat treatment type furnace, the lot shall include only that pipe which is heat-treated in nace charge. size and wall to the same is in a batch the same fur- 8.1 Tensile Test - The yield strength, tensile strength and the percentage elongation of the steel tubes when determined in accordance with IS : 18941972* shall conform to the values specified in Table 3. 8.2 Flattening or Bend Test 8.2.1 For pipe sizes 50 mm NB and below bend test shall be carried out. For pipes over 50 mm NB flattening test shall be carried out. 8.2.1.1 Flattening test - The flattening test shall be carried out in accordance with IS : 2328-1963t. The test piece shall consists of 63.5 mm long pipe taken from one end of each selected pipe. The test piece shall be flattened cold between parallel plates and shall show no crack or flaw when the distance between the plates is not greater than H. J.f_ (l+C)a C+a D where H= a= D= C= distance between the plates (mm), specified thickness (mm), specified outside diameter (mm), and a constant depending on the grade of steel=0*87. NOTB; 1 - Surface imperfectionrevealed during flattening test,. shall be removed by grinding and shall be checked for the minimum required wall th&cness. NOTE 2 - Superficial rUptu& resulting from surface imperfections shall not be a cause for rejection. 8.2.1.2 Bend test shall be carried 1963:. out in accordance with IS : 2329A suf&cient length of tube shall be bent cold through 90" around *Method for flattening test on steel tubes. $Method for bend test on steel tube-s. 9 *Methodfor tensile testing of steel tubea. TABLE 3 TENSILE (Clause REQUIREMENTS 8.1 ) TENSILE YIELD ELONOATION ON 5.65@ PERCENT STEIIL GRADE REFERENCE HEAT TREATMENT HEAT TREATMENT k_-----7 Normalized or Annealed Tempered r------------h---7Temygature Cb&g Tempeeture 0000~ tiOll tion (5) 600-650 640-720 650-780 650-750 640-720 (6) STRENGTH STRENMPa GTH MPa Min Min Min E; (1) 16Mo30 15CT!x%4055 lOCrYMo5S 1OCr2Moi (2) N, N+T N+T (3) 900-940 900-960 850-880 900-960 900-960 900-960 930-980 (4) a ; f (7) 440-590 440-590 410-560 410-560 490-640 490-640 460-610 (8) 250 250 205 175 275 275 275 (9) 22 22 20 20 16 15 15 A A N+T N+T N+T - a a lKr45Mo6OV27 -- a a a a a a N-Normalized. N+T=Normalized A = Annealed. a = Aircooled. and tempered. f = Furnace cooled. rs:6630-1985 a cylindrical mandrel the diameter of which is 12 times the nominal diameter of the tube, without developing cracks. 8.3 Hydraulic Test 8.3.1 Each tube shall be tested at the manufacturer's work with hydraulic pressure of 1.5 times the design pressure but in no case less than 7 MPa ( 700N/cm2 ) nor greater than the pressure P calculated from the following formula: where P = test pressure in MPa, S = stress in N/mm2 which shall be taken as 80 percent of the minimum yield stress at room temperature, t = specified thickness in mm, and d = outside diameter in mm. NOTE1 MPa = 1 N/mm* = O-102 kgf/mm'. 8.3.2 The test pressure shall be maintained sufficiently long but not less than 5 seconds for proof and inspection. Any tube failing to withstand the hydraulic pressure test shall be deemed not to comply with the standard. 8.4 Non-destructive Testing - By an agreement between the manufacture and the purchaser the tubes may be subjected to non-destructive testing by a suitable method including the reference standards. 9. RETESTS 9.1 If the test specimen representing a heat fails to conform to the requirements specified in 4, an analysis of each pipe from the same heat may be made and all pipes conforming to the requirements shall be accepted. 9.2 If the test specimen representing a lot of pipes fails to conform to the requirements specified in 8.1 and 8.2, the manufacturer may elect to make retests on two additional lengths from the same lot. If both the retest specimens conform to the requirements, all the lengths in the lot shall be accepted except the length from which the initial specimen was taken. If one or both of the retest specimens fail to conform to the specified requirements, the manufacturer may elect to test individually the remaining \engths in the lot, in which case determinations are required only for the particular requirements with which the specimens failed to comply with the preceding tests. 11 IS : 6630 - 1985 10. MARKING 10.1 The pipes shall be marked with the following particulars: a) Manufacturer's c) Grade, name or trade-mark, b) Nominal size and thickness, d) Heat number, and e) Type of steel. 10.1.1 The following symbols may be used for indicating the type of steel: Electric furnace steel Open hearth steel Basic oxygen 10.1.1.1 Suitable symbols may be used for E R BO steel made by other appro- ved processes. 10.2 BIS Certification Marking The product lnay also be marked with Standard Mark. 10.2.1 The use of the Standard Mark is governed by the provisions of Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The details of conditions under which the ticence for the use ofStandard Mark may be granted to manufacturers or producers may be obtained froin the Btireau of Indian Standards. 11. TEST CERTlFICATE 11.1 If specified in the order, the supplier shall furnish test certificate containing the following: certified copies of a) b) c) d) e) f) g) h) Purchaser's order number; Specification, title and grade; Heat number; Nominal size, wall thickness and quantity of pipes; Product analysis; Results of mechanical tests at room temperature; Results of any supplementary test; and Signatures and stamp of inspecting authority. 12 APPENDIX ( Clause 0.2.1 ) ELEVATED TEMPERATURE A-l. A PROPERTIES The elevated temperature yield stress properties of the steels are as given in Table 4. TABLE 4 ELEVATED TEMPERATURE YIELD STRESS t; STEU GRADE HEAT TREAT ~_____--_.-__---__20°C 5O'C 100°C MENT (2) N+T N i-T (3) 268 (4) 254 (5) 240 REFERENCE YIELD STRESS IN 15O'C 200°C (6) 230 (7) 220 MPa AT TEMPERATURE OF -W--W_---250°C 300°C 350°C 400°C 450°C! 500°C 550-c (8) 210 (9) 183 (10) 169 (11) 164 6OO"d (15) 146 135 (1: 15Cr90Mo55 14CrzMo_6 v27 270 266 259 108 261 248 99 153 235 92 245 218 85 236 192 80 230 184 74 224 177 72 218 (i2) 161 168 69 (13) 156 155 66 189 (14) 151 148 167 A 129 121 N+T 272 268 N+T=Normalized and tempered. A = Annealed. lOCr2Mol 145 205 A-2. The stress rupture properties of the steels are given in Table 5. As in the Original Standard, this Page is Intentionally Left Blank IS:6630-1989 TABLE 5 STRESS RUPTURE PROPERTIES ( Ckuse A-2 ) GRADE STEEL REFERENCE. HEAT TREATMENT (2) RUP~URB TlMF __.._- --450°C h 460°C 470°C -480°C ESTIMATED AVERAGESTRESS FOR RUPTURE IN hWa 490°C SOOT -~ 510°C 520°C 530°C TEMFWU~Z~RE OF _--_-_. -m-5u)"C sso"c 560°C 57o'C AT 580°C 590°C 600°C' (1) I sCt?$sioSS- (3) 10000 30000 50000 100000 150000 200000 250 000 10000 30000 50000 100000 150000 200000 250 000 10000 30000 50 000 100000 150000 200000 250000 (4) (251) (226) 211 196 193 1'86 181 (5) (236) (211) 197 182 177 170 165 ( 285 ) (254) 236 204 192 186 181 (6) - (7) 304 267 239 210 194 180 170 299 261 243 218 205 194 185 206 181 170 154 145 138 132 240 213 197 170 158 152 147 (8) 273 233 207 177 161 148 139 268 232 217 191 179 169 160 191 168 156 141 129 123 118 219 192 177 153 141 135 130 beyond (9) 239 200 177 146 132 122 114 241 209 193 170 156 145 138 177 153 142 127 116 110 105 196 172 158 137 126 119 113 (10) 209 169 149 121 108 99 91 219 187 172 150 136 127 119 162 139 128 115 103 97 93 176 152 139 122 110 103 98 range (11) 179 140 124 99 87 79 ?4 198 168 153 131 119 109 101 147 126 116 102 9P 85 81 155 134 123 107 95 89 84 covered (12) 154 116 101 81 77 64 59 179 152 136 116 101 91 83 133 113 104 90 79 75 72 137 117 107 93 82 77 74 (13) 129 96 82 67 57 52 48 164 135 121 100 85 76 68 121 101 92 78 71 66 63 122 103 93 79 73 68 64 (14) 109 76 68 54 46 42 39 148 121 107 85 70 61 54 108 89 81 69 56 58 54 108 90 80 69 63 58 55 (1% 91 66 55 43 38 34 32 134 107 92 72 57 48 (42) 96 78 71 59 54 SO 47 96 79 71 59 54 50 47 (16) 76 54 4s (::) (28) (25) 121 93 78 59 (45) (37) (32) 85 70 62 51 46 43 40 85 70 62 5) 47 43 41 (17) 64 44 1 108 80 66 (3456) (28) 76 61 54 44 (ZY) ( 35 ) 76 61 54 44 (4307) ( 35 ) (18) 53 36 95 67 68 54 47 ( 38 ) ( 35 ) (32) (30) 68 54 $) ( 35 ) ( 32 ) ( 30.) (19) N+ T 221 1% 183 168 161 154 149 263 233 217 186 175 169 164 2 78 50 61 ( 48 ) (Z) ( 30 ) (28) ( 26 ) 61 48 42 ( 34 ) (30) (28) (26) 14Cr4SMo N+T 63v2z lOCr2Mol A N+T 10 000 ( 309) 30000 (276) 257 50 000 221 100000 209 150000 203 200 000 198 250 000 N+T~~hzed -Values given in parenthesesare obtained by extrapolation and tempered. A=anneakd. the stress by the test data and are thus subject to greater uncertainty. As in the Original Standard, this Page is Intentionally Left Blank IS : G630- 1985 ( Continuedfiom page 2 ) Panel for Revision of IS : 1914, IS : 3609 and IS : 2416, SMDC 22/P-18 Convener SHRI Representing The D. DUTTA Indian Tube Co Ltd. Jamshedpur Shri D. Dutta ) SHRI B. N. DAS SHRI M. THOLKAPPIAN( Alternate SHHI N. P. JYOTY SHRI R. K. ABROL ( Alternate ) SHRI N. N. RAY SHIU S. L. THEOBALD( AIterrrate ) SHRI S. K. SINHA SHHI A. SRMIVASULU SHRI H. J. THAKER Members Snmr R. RAMA RAO ( Alternate to Tube ) Bharat Products of India, Madras New Delhi Steel Tubes Ltd. Central Boilers Board, New Delhi ACC-Babcock Ltd. Calcutta Bharat Heavy Electric.& Ltd, Tiruchchirappalli Gujarat Steel Tubes Ltd, Ahmadabad 17 BUREAU Headquarters OF : INDIAN STANDARDS Manak Bhavan, 9 Bahadur Shah Zafar Marg. NEW DELHI 110002 Telephones : 331 01 31 Telegrams 331 13 75 Regionel Central l : Manaksansths Offices : (Common to all Offices) Telephone 331 01 31 i 331 13 76 37 86 62 21843 41 29 16 6 32 92 95 : Marrak Bhavan. 9, Bahadur Shah Zafar Marg. NEW DELHI 110002 : 1114 C.I.T. Scheme VII M. V.I.P. Road, Maniktola. CALCUTTA 700054 : SC0 445-446, Sectoi 35-C. CHANDIGARH 160036 : C.I.T. Campus, IV Cross Road, MADRAS 600113 : Manakalaya, E9 MIDC, Marol. Andheri (East), BOMBAY 400093 Offices : 380001 Eastern Northern Southern Western Branch t `Pushpak', Nurmohamed Shaikh Marg, Khanpur, AHMADABAD ! Peenya Industrial Area, 1st Stage, Bangalore-Tumkur Road. BANGALORE 560058 Gangotri Complex, 5th Floor, Bhadbhada Road, T.T. 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